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Mobilization of different phosphate fractions in the rhizosphere

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Abstract

Availability of soil P fractions and mechanisms of acquisition by plants were studied. Plants mobilize soil P by desorption via depletion of P solution concentration around roots. In an oxisol, the process was enhanced by nitrate N nutrition of ryegrass, which increased soil pH, and by carboxylate release by white lupin. Ligand exchange and Fe/Al solubilization are assumed to be the mechanisms. Ammonium N nutrition of ryegrass decreased pH and allowed P mobilization in a luvisol but had no such effect in an oxisol, due to acid solubility of P in these soils. Organic P dissolved in soil solution contributed one third to the P uptake of field-grown barley on a luvisol. Laboratory experiments suggest that organic P is hydrolyzed by phosphatases at the root surface and replenished by micro-organisms.

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Authors and Affiliations

  1. Institute of Agricultural Chemistry, Georg August University, von Siebold-Str. 6, D-37075, Göttingen, Germany

    A. Jungk, B. Seeling & J. Gerke

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  1. A. Jungk
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  2. B. Seeling
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  3. J. Gerke
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Jungk, A., Seeling, B. & Gerke, J. Mobilization of different phosphate fractions in the rhizosphere. Plant Soil 155, 91–94 (1993). https://doi.org/10.1007/BF00024991

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